Peters



(Model J v E. 0. CARVIN PIPE WRENCH. No. 367,786. Patented Aug. 9,1887.

WITNESSES INVENTOR WC/QL Z $0M M \BY 2644mm 2 ATTORNEYS.

UNITED STATES PATENT OFFICE.

" EDWARD O. OARVIN, OF CORVALLIS, OREGON.

PIPE-WRENCH. i

SPECIFICATION forming part of Letters Patent No. 367,786, dated August9, 1887.

7 Application filed October 5, 1886. Renewed July 8, 1887. Serial No.243,762. (Modeh) T0 at whom it may concern.-

Be it known that I, EDWARD O. CARVIN, of Corvallis, in the county ofBenton and State of Oregon, have invented a new and useful Improvementin Pipe-Tongs, of which the followingis a full, clear, and exactdescription.

My invention relates to pipe-tongs; and it consistsin a wrench having ashank provided with a detachable concave jaw, and a co-operative jawwhose face is also concaved and pivotedin a slot in said shank, therelative position of the jaws to each other being such that as soon asthe operator closes down upon the pipe or rod,through thcmedium ofaspringactuated lever attached to the shank and united to the pivoted jawby means of a connectingrod, the wrench tightens in proportion to theforce applied, as will he hereinafter fully described and claimed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

I Figure 1 is a side elevation of my pipetongs, and Fig. 2 is a view ofthe same turned one-quarter around.

A is a shank provided at one end with a dovetailed slot, a, cut toreceive the detachable jaw B, whose toothed engaging-surface isconeaved, and at the other with a rounded surface, 0, to facilitatehandliugf The detachable jaw Bis h'eld imposition by means of a screw,b, passing through the shank A and engaging its underside.

Thelever D,pivoted by arms (I d to the shank A near its rounded surface,has riveted to its under side, in close proximity to its disengaged end,a spring, 0. The free end of this spring 6 engages and bears upon theshank A, serving to keep the lever D operation.

An extension, E, formed upon the outer surface of the lever D, over thespace between its pivotal armsd d, is united by means of aconnecting-rod, R, to the jaw S, pivoted in a slot, W, in the shank A.

extended when not in In my tongs, by the use of the dovetail slot 0 andfastening-screw b, I am enabled to use different-size jaws therein,making the tongs adjustable to different sizes of pipe, and by havingthe jaws concave I gain agreat amount of bearing-surface and render thetongs less liable to break or otherwise injure the pipe.

The spring 0, in its attachment to the lever 5 D and bearing upon thehandle O, causes, thronghlthe medium of the extension E andconnecting-rod R, thepivoted jaw S to remain open when not in operation.Thus the wrench may at all ti mes be taken up for use, ready to graspany rod or pipe within the compass of its adjustment.

In operation the lever D becomes a handle, together with the roundedsurface 0 of the shank A, as in clinching the pipe thelever D, pivotedby the arms (1 (l to the shank A, is drawn closely into the roundedsurface 0 of said shank A, flattening the spring 0 thereto, and is heldin this position when in use. This movement of the pivoted lever Dcauses the connecting-rod It, through the extension E, to 1 draw downthe pivoted jaw S into cooperation with thejaw B, dovetailed upon theshank A, to clamp and hold the pipe firmly.

Having thus fully described inyinvention, I claim as new and desire tosecure by Letters Patent- The herein-described 'iipe-wrenel'i,consisting of the slotted shank A, provided with the stationarydetachable jaw B, the movable jaw S, pivoted in the slot of theshank,with its end projecting through the said slot, the lever D,

pivoted to the shank and provided with the extension E, the spring e,secured to the lever and engaging the shank, and the rod Bi, con-'necting the extension of-the lever with the end of the movable jaw, asspecified.

EDWARD O. GARVIN.

Witnesses:

E. lVIARPLE, J. W. RAYBURN.

